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XTPower – the quality brand for your mobile power supply!Why an XTPower solar backpack? The solar panel in the XTPower solar backpack has a higher solar radiation uptake than normal solar modules. This means you produce more power per solar panel. The removable compact solar charger means more flexibility for the backpack. Handy clips make it simple to secure the solar collectors on the backpack. You can simply take the panel off and put it in direct sunshine. XTPower travel backpack are suitable for minimalists who care about every extra pound. Ultra light. Extremely durable. Very sophisticated. The backpack is perfect for day-to-day use or travel. Adjustable straps and breathable material turn this backpack into a comfortable solution for the whole day. Another benefit of this backpack is the design of several compartments. The backpack has a classic shape with several zipper compartments for optimal organization. It has a spacious main compartment with room for accessories such as laptop, notebook, iPad, books, gadgets and keys. The solar cells are protected by a scratch resistant surface. They are sewn into a PVC cover to ensure durability. This product is ideal for daily use, travel, and outdoor activities including backpacking, trekking, mountaineering, fishing, biking, etc.Technical Data:Solar panel: – Output: 6V 1.1 A / 6.5 Wh (max. output) – Cell type: Monocrystalline – Degree of efficiency: 22% – Output: 1x USB with 6V 1.1 A, equaling 6W (max. power) Dimensions: 21.3 x 8.7 x 15.4 inWeight: 1.8 lbsImportant note: The solar panel performs best in direct sunlight. In changing sunlight, the output performance of the solar panel can vary. We recommend the use of a buffer battery (e.g. XTPower XT-13000). In this case, you charge the intermediate battery with the solar panel. The intermediate battery provides a constant charging power.